<template>
  <div class='home-category'>
    <!-- 有数据之后遍历真实数据 -->
   <template v-if="menuList.length > 0">
      <ul class="menu">
      <li v-for="item in menuList" :key="item.id" @mouseenter="mouseEnter(item.id)">
        <RouterLink to="/">{{item.name}}</RouterLink>
        <template v-if="item.children">
          <RouterLink
            v-for="sub in item.children"
            :key="sub.id"
            to="/"
          >
            {{sub.name}}
          </RouterLink>
        </template>
          <!-- 弹层 -->
        <div class="layer">
          <h4>分类推荐 <small>根据您的购买或浏览记录推荐</small></h4>
          <ul v-if="currCategory && currCategory.goods && currCategory.goods.length">
            <li v-for="item in currCategory.goods" :key="item.id">
              <RouterLink to="/">
                <img v-imgLazy="item.picture">
                <div class="info">
                  <p class="name ellipsis-2">{{item.name}}</p>
                  <p class="desc ellipsis">{{item.desc}}</p>
                  <p class="price"><i>¥</i>{{item.price}}</p>
                </div>
              </RouterLink>
            </li>
          </ul>
        </div>
      </li>
    </ul>
   </template>
   <!-- 数据正式返回之前显示骨架屏 -->
   <template v-else>
     <ul class="menu">
       <li v-for="i in 9" :key="i">
          <XtxSkeleton
            width="40px"
            height="20px"
            style="margin-right: 5px"
            bg="rgba(255,255,255,0.2)"
          />
          <XtxSkeleton
            width="50px"
            height="20px"
            bg="rgba(255,255,255,0.2)"
            style="margin-right: 5px"
          />
          <XtxSkeleton width="50px" height="20px" bg="rgba(255,255,255,0.2)" />
        </li>
     </ul>
   </template>
  </div>
</template>

<script>
import { computed, ref } from 'vue'
import store from '@/store'
export default {
  name: 'HomeCategory',
  setup () {
    const menuList = computed(() => {
      // 侧边栏数据保存
      const list = store.state.category.list.map(item => {
        return {
          id: item.id,
          name: item.name,
          // 防止初始化没有children的时候调用slice函数报错
          children: item.children && item.children.slice(0, 2)
        }
      })
      return list
    })
    // 保存当前选中项id
    const categoryId = ref(null)
    // 鼠标移入
    function mouseEnter (id) {
      categoryId.value = id
    }
    const currCategory = computed(() => {
      // 通过当前id筛选出goods中对应id的数据
      return store.state.category.list.find(item => item.id === categoryId.value)
    })
    return {
      menuList,
      mouseEnter,
      currCategory
    }
  }
}
</script>
<style scoped lang='less'>
.home-category {
  width: 250px;
  height: 500px;
  background: rgba(0, 0, 0, 0.8);
  position: relative;
  z-index: 99;
  .menu {
    li {
      padding-left: 40px;
      height: 55px;
      line-height: 55px;
      &:hover {
        background: @xtxColor;
      }
      a {
        margin-right: 4px;
        color: #fff;
        &:first-child {
          font-size: 16px;
        }
      }
      .layer {
        width: 990px;
        height: 500px;
        background: rgba(255, 255, 255, 0.8);
        position: absolute;
        left: 250px;
        top: 0;
        display: none;
        padding: 0 15px;
        h4 {
          font-size: 20px;
          font-weight: normal;
          line-height: 80px;
          small {
            font-size: 16px;
            color: #666;
          }
        }
        ul {
          display: flex;
          flex-wrap: wrap;
          li {
            width: 310px;
            height: 120px;
            margin-right: 15px;
            margin-bottom: 15px;
            border: 1px solid #eee;
            border-radius: 4px;
            background: #fff;
            &:nth-child(3n) {
              margin-right: 0;
            }
            a {
              display: flex;
              width: 100%;
              height: 100%;
              align-items: center;
              padding: 10px;
              &:hover {
                background: #e3f9f4;
              }
              img {
                width: 95px;
                height: 95px;
              }
              .info {
                padding-left: 10px;
                line-height: 24px;
                overflow: hidden;
                .name {
                  font-size: 16px;
                  color: #666;
                }
                .desc {
                  color: #999;
                }
                .price {
                  font-size: 22px;
                  color: @priceColor;
                  i {
                    font-size: 16px;
                  }
                }
              }
            }
          }
        }
      }
      &:hover {
        .layer {
          display: block;
        }
      }
    }
  }
}
</style>
